排序方式: 共有44条查询结果,搜索用时 31 毫秒
31.
根据混合动力电动汽车镍氢动力电池研发需要,针对其结构特点和工作原理,设计了144 V/(6.5 A·h)镍氢电池组的实验方案,提出了放电效率、电池内阻的处理方法,并利用Matlab软件对实验数据进行处理,结合放电电流、荷电状态、电池内阻和环境温度等相关参数之间的影响,分析了电池组的端电压特性、内阻性能以及电池组在常温、高温、低温下的放电特性,结果表明,镍氢电池组在常温和高温下具有良好的放电特性,电池组不适宜在-30℃下工作. 相似文献
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As the most possibility applied to the next generation negative electrode materials of Ni/ MH second battery, rare earth (RE)-magnesium (Mg) based alloys have been developed over the last few years. Recent advances about the RE-Mg based intermetallic compounds on the crystal structures, hydrogenation behaviors and electrochemical performances are reviewed in the paper. On the other hand, new results about the preparation and modification methods of the alloys are also covered in details. 相似文献
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用MH状态方程法计算含二甲醚体系的热力学性质。计算表明,MH-81状态方程不仅能较好地预测纯物质的热力学性质,而且能满意地描述混合物的相平衡行为。 相似文献
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Thermal behavior of overcharged Ni/MH battery is studied with microcalorimeter. The battery is installed in a special device
in a microcalorimeter with a quartz frequency thermometer. Quantity of heat and heat capacity of the battery charged at different
state of charge (SOC) at different rates are measured by the microcalorimeter. Based on a series of assumputions, heat transfer
equation is set up. Expression of heat generation is attained by curve fitting instead of theoretical calculation. Thermal
model is used to simulate thermal behavior of the battery in charging period, results of calculation and experiment match
very well. The temperature distribution is non-uniform because the poor conductivity limits the heat transfer during charging
process. It is difficult to greatly improve the heat conductivity of the battery because it is related to materials inside
the battery including electrodes, separators and so on. Therefore, high rate charge should be avoided in actual use. It may
cause some damage to the battery.
Supported by the National Key Basic Research and Development Program of China (Grant No. 2002CB211800) 相似文献
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采用SEM,XRD,TEM以及EIS等检测方法,研究不同过充循环前后MH/Ni电池性能与正负极材料形貌及表面元素的变化.实验结果表明,经正常充放电循环70周后,正极活性物质表面保持良好的球形形貌,而经持续过充电循环相同次数后,因晶格的不可逆膨胀而呈不同程度破裂,储氢合金颗粒并无明显粉化现象,但其表面却覆盖许多绒状或针状物,经能谱检测,该绒状物主要成分为稀土金属的氢氧化物或氧化物.EIS阻抗谱分析表明,电池的欧姆电阻(Rs)、反应电阻(Rt)和Warburg阻抗(Zw)均有不同程度的增加,而界面电容(Ci)则呈逐渐降低趋势,这些均是最终导致电池电化学性能衰减的原因. 相似文献
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混合动力汽车电池管理系统SOC的评价 总被引:22,自引:3,他引:22
为建立混合动力汽车电池管理系统的需要,探索镍氢电池荷电状态(SOC)的实时测量和估计方法,分析当前一般SOC定义在变电流放电情况下出现不适应的原因,和现有各种荷电状态估计方法存在的问题。为此,根据能量守恒原理,提出了一种新SOC的概念,使之能很好地适应混合动力汽车用电池在变电流状态下的实时荷电状态估计,并且基于新的SOC定义,建立电池荷电状态计算模型,进行仿真分析,简化计算,明确物理意义,提高了SOC的判断精度,减少混合动力汽车的复杂性,减少整车的成本,为混合动力汽车系统优化匹配提供了依据。 相似文献
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广西地不容种质离体保存技术研究 总被引:2,自引:0,他引:2
以广西地不容(Stephanie kwangsiensis H.S.Lo))试管苗为材料,研究室温(25±2)℃光照2000lx(12h/d)条件下,培养基中不同无机盐水平(MS、1/2MS、1/4MS)、蔗糖浓度(0、20、40、60g/L)和植物生长抑制剂CCC(0.4、0.8、1.2、1.6、2.0、2.5mg/L)、PP333(0.2、0.5、1.0、2.0、4.0、8.0mg/L)、ABA(0.2、0.5、1.0、2.0、4.0、8.0mg/L)、MH(0.2、0.5、1.0、2.0、4.0、8.0mg/L)对广西地不容试管苗保存存活率的影响。结果表明,MS添加蔗糖20~40g/L适合作为广西地不容离体保存的基本培养基,附加一定浓度的CCC、PP333、ABA和MH能有效抑制试管苗的旺盛生长,长时间保存后的存活率高;ABA易引起试管苗早衰,保存效果不佳。对广西地不容试管苗保存效果较好的两个培养基配方为:MS CCC0.4~2.5mg/L 蔗糖30g/L和MS PP3330.2~0.5mg/L 蔗糖30g/L,这两个配方可以不继代连续保存360~380d,存活率60%~80%。 相似文献
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Yongjie Yuan Zhentao Dong Yuan Li Lu Zhang Yumeng Zhao Bo Wang Shumin Han 《自然科学进展(英文版)》2017,27(1):88-92
LaFeO_3-xwt% r GO composite(x = 8, 10, 12) was synthesized by ultraphonic stirring and lyophilization method.SEM, TEM and XRD results show that the perovskite-type LaFeO_3 was dispersed by rGO to form special porous structure due to the gauze-shaped wrinkles and folds structure of rGO. It was found that the special porous structure can effectively increase the specific surface area and suppress particle aggregation of LaFeO_3, thus improving the electrical conductivity and appreciably enhancing the electrochemical properties of LaFeO_3. As compared with LaFeO_3, the maximum discharge capacity of the composite(x=10) increased from 209.5 mAhg~(–1) to 334.6 mAhg~(–1).The High rate dischargeability at a discharge current density of 1500 mAg~(–1)(HRD1500) and the capacity retention rate after 100 charge/discharge cycles(S100) of the composite increased by 9% and 17%, respectively. 相似文献